Allow only one br in nl2br

了解，您需要在 NL2BR 中仅允许一个 br 标签。您可以通过以下方法实现：

使用 CSS 样式来限制仅有一个 br 标签：

br {
  display: none;
}

使用 JavaScript 来删除多余的 br 标签：

const elements = document.querySelectorAll('br');

elements.forEach((element) => {
  if (element.nextSibling !== null) {
    element.remove();
  }
});

在 HTML 中使用程序式语言来删除多余的 br 标签：

<template>
  <div>
    <content>
      <br />
      <br />
      <content />
    </content>
  </div>
</template>

以上方法都可以实现 NL2BR 中仅允许一个 br 标签。

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